/**
 * Description:一些注释<br/>
 * CreateTime:2019-03-26<br/>
 * Creater: yangpengfei360@126.com <br/>
 * @author yangpengfei
 */
package cn.cnsy123.bookwebsiteserver.util;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;

/**
 * Description:一些注释<br/>
 * CreateTime:2019-03-26<br/>
 * Creater: yangpengfei360@126.com <br/>
 * 
 * @author yangpengfei
 */
public class MD5PassWordEncoder {
    private static final char[] DIGITS_LOWER = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',
            'e', 'f' };

    private static final char[] DIGITS_UPPER = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
            'E', 'F' };

    private static char[] encodeHex(final byte[] data, final char[] toDigits) {
        final int l = data.length;
        final char[] out = new char[l << 1];
        for (int i = 0, j = 0; i < l; i++) {
            out[j++] = toDigits[(0xF0 & data[i]) >>> 4];
            out[j++] = toDigits[0x0F & data[i]];
        }
        return out;
    }

    public static String md5Hex(byte[] data) {
        return md5Hex(data, false);
    }

    public static String md5Hex(String str) {
        try {
            return md5Hex(str.getBytes("UTF-8"), false);
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        }
    }

    public static String md5Hex(byte[] data, boolean isUpper) {
        try {
            return new String(
                    encodeHex(MessageDigest.getInstance("MD5").digest(data), isUpper ? DIGITS_UPPER : DIGITS_LOWER));
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}
